#include<iostream>
#include<vector>

int main()
{
	std::vector<int> foo(3, 100);	// three ints with a value of 100
	std::vector<int> bar(5, 200);	// five ints with a value of 200

	foo.swap(bar);

	std::cout << "foo contains:";
	for (unsigned i = 0;i < foo.size();i++)
		std::cout << ' ' << foo[i];
	std::cout << std::endl;

	std::cout << "bar contains:";
	for (unsigned i = 0;i < bar.size();i++)
		std::cout << ' ' << bar[i];
	std::cout << std::endl;
}